Door-bolt.



Patented Iuly I7, |900. W. T. ADAMS.

D003 BOLT.

(Application filed Apr. 21, 1900A (No Model.)

TH: Nonms PETERS co.. Pnouumo., wAsmucToN. D. c.

UNrTnn STATES PATENT Prion.

VILLIAM T. ADAMS, OF READING, PENNSYLVANIA.

DOOR-BOLT.

SPECIFICATION forming part of Letters Patent No. 654,106, dated July 17', 1900.

Application filed April 21,1900. Serial No. 13,747. (No model.)

T0 @ZZ whom t may concern:

Be it known that I, WILLIAM T. ADAMS, a citizen of the United States of America, and a resident of Reading7 in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Door- Bolts, of which the following is a specification.

My invention relates particularly to that class of door-bolts which is operated by means of finger-levers designed to lie flush with the face of the door when the bolt is in either projected or retracted position.

The invention is fully described in connection with the accompanying drawings, and the novel features are particularly pointed out in the claim.

Figure l is a front face view of a bolt embodying my improvements. Fig. 2 is a full rear View of the same. Fig. 3 is a side elevation, partly in section, the operating-lever being shown in its middle position. Fig. l is a similar view to Fig. 3, showing a slightlymodifled construction.

A represents the bolt case or frame, which comprises a front plate formed with a leverslot ct, terminating in finger-clippings a ct', and b is a bolt-operating lever which is piv otally mounted within the slot-recess and is provided with a rear arm or arms 19353, arranged to operate the slide-bolt plate C. This bolt-plate, as shown, forms a movable bottom to the slot-recess a, in which the lever B is mounted, it being arranged to ride on the outer edges a3 a3 of parallel rear ribs or plates a2 a2 on the case-plate A, which ribs form the side walls of the slot-recess a and are provided with bearing-openings a4 a4, in which the lever B is pivotally seated, as indicated, thus bringing the pivotal center of the latter as close as possible to the case-plate A. The outer portion b' of the lever B is adapted to lie normally within the recess a either above or below the pivotal center b, with its outer or finger end b2 extending into one or other of the cupped recesses a a' in the case-plate. Within the latter the lever is provided, preferably, with two parallel inner arms b3 b3, lying outside of the vertical ribs or plates a2 a2 and having ends b4 b4, each of which is arranged, as shown, to bear against an ear c on one side or other of the bolt-plate C, so as to move the latter up or down with the corre sponding movement of the lever-arms. A spring D, fixed to the bolt-plate, is arranged with its free end bearing upon the end of an arm b3, so as vto press the latter toward the inner face of the case-plate, thus normally forcing the outer portion b' of the lever into flush position in the recess a of the bolt-case, above or below the pivotal point b, except when raised by the operator to either project or retract the bolt. As the spring D always -moves with the bolt-plate in the same direction that the operating-arm b3 of the lever swings, it is at all times bearing on said arm at substantially the same distance from its fixed connection to the bolt-plate, thus avoiding any considerable wearing action and at the same time providing a practically-uniform tension upon the lever B.

The bolt-plate C moves in suitable guides a5, provided at the rear of the case A, prefer-Y ably on the outer edges of the vertical ribs or plates a2 c2, as shown, so as to form a movable rear wall of the recess a, the outer face of the bolt-plate which is -thus exposed being finished before assembling the parts.

The front or outside view of my bolt, as indicated in Fig. l, shows merely the case-plate with recess a terminating in iinger-cuppings and bounded by entirely-closed side and rearl walls having no unsightly dirt-catching openings and the outer portion b of the lever lying flush in said recess. The pivoting-trunnions of the lever, fitted in the bearing-openings in the side wall ribs or plates a2 a2, lie close to the rear wall of the case-plate, thus locating the pivotal center b as near to the latter as possible and permitting of the greatest possible swing of the inner lever-arms b3 andresulting movement of the bolt-plate with comparatively-little cutting away of the door.

In Fig. 4 I have indicated a slightly-modified construction embodying my invention and adapted more particularly to provide for a more extended movement of the bolt-plate C. In this construction the inner arms of the lever instead of operating directly upon the bolt-plate are connected thereto by a link E, and the spring D', which is carried, as before, by the lock-plate, is arranged to bearupon said link instead of upon the lever-arms IOO or arms lying parallel with and at the outer side of said ribs, and a slidingplate at the rear of said ribs arranged in engagement I5 with said operating arm or arms substantially as set forth.

Signed by me at Reading, Pennsylvania, this 18th day of April, 1900.

WILLIAM T. ADAMS.

Witnesses:

GEO. E. TYsoN, WALTER B. CRAIG. 

